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Review of the American Standard Specifications, Test Pieces, and Methods of Testing Iron and Steel, Adopted by Committee No. 1 of American Section of the International Association for Testing Materials; With a Discussion of the Commercial Methods for the (Paperback)
Loot Price: R258

Review of the American Standard Specifications, Test Pieces, and Methods of Testing Iron and Steel, Adopted by Committee No. 1 of American Section of the International Association for Testing Materials; With a Discussion of the Commercial Methods for the (Paperback)

This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1900 Excerpt: ...tions iQ detail, are the ones most generally used
in of Phosphorus. American steel works laboratories, for the
determination of phosphorus in steel. (a). The Drown-Emmerton
method. Time, thirty minutes. Accuracy, 0.002%. ( ). The
Handy-Manby method. Time, ten minutes. Accuracy, 0.003%. (a). The
Drown-Emmerton Method.--This method depends on the conversion of
all the phosphorus, in a nitric acid solution of the steel, into
orthophosphoric acid by means of potassium permanganate; the
reduction of the manganese dioxide formed, by a small amount of
sugar; and the precipitation of the phosphorus by ammonium
molybdate. The yellow precipitate may be weighed as such; or
preferably dissolved in ammonium hydroxide, the solution acidulated
with sulphuric acid, and the molybdic oxide, forming a known
proportion of the phosphomolybdate precipitate, reduced to
molybdous oxide by passing the solution through a column of
amalgamated zinc, and then oxidizing by a standard solution of
potassium permanganate. Attention has frequently been called to the
many little details of the process which long experience has shown
to be necessary, to insure accuracy. It is notably a method in
which success is only attained by experience. The solution of the
steel, and precipitation of the phosphorus, may be conveniently
effected in an Erlenmeyer flask. The phosphorus is completely
precipitated by agitation for five minutes. Suction is used in
filtration; special forms of reductors and permanganate burettes
have been devised which contribute materially to the rapidity of
the process, and its adaptability to the determination of
phosphorus in ten or twenty steels at a time. The method is
accurate to within 0.002 % insteelsof o. 10% phosphorus or below. A
single determination may be rea...